How to change wash on leaking basin mixer?

My bathroom mixer is leaking by the hot water side that we turn. I cannot find any screws on the mixer to open and change the washer. Any idea how to open it without scratching it.

Below is a link to the picture

https://photos.app.goo.gl/eZNbdBNrRbxouNY86

Reply from 1 tradesperson

Its not easy to open you need some tools to open it

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